Where is the relief valve in refrigeration system?

Relief valves: Relief valves are fitted in discharge side of compressor and will lift and safeguard the compressor in the event of over pressure. One relief valve is also fitted in the condenser refrigerant line to avoid damage to the condenser if there is high pressure in the discharge line.

How meat room and fish room temperature is maintained?

VEGETABLE ROOM TEMPERATURE IS MAINTAINED AT 4°C WHILE THAT OF FISH AND MEAT ROOM ABOUT -15 TO -20°C. THE REFRIGERANT REQUIREMENT OF FISH AND MEAT ROOM IS MORE THAN THAT OF VEG ROOM AND HENCE REFRIGERANT QUANTITY TO VEG ROOM IS LESS THAN THAT OF OTHER TWO ROOMS. THIS IS CONTROLLED BY THERMOSTATIC EXPANSION VALVE.

What is back pressure in compressor?

Simply put, back pressure is pressure that is held back. “Back” in this context means against the natural flow of fluid or gas. In oil and gas applications it refers to upstream pressure that is held, or maintained, in a variety of production vessels to provide the right conditions for separation and processing.

What is the function of the expansion valve?

The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. The high-pressure liquid refrigerant entering the expansion valve is quite warm.

What is the pressure relief valve in HVAC?

Pressure relief valves are used to control and limit the pressure build-up in a system. If pressure exceeds the amount allowed by the pressure relief valve, the pressure relief valve will automatically open and release air until the pressure is reduced.

What is the purpose of evaporator?

The main job of the evaporator coil is to cool the refrigerant so that it can absorb the heat. As the fan blows air over the coil, the refrigerant becomes cold and turns into a vaporous state.

What is cascade refrigeration system?

In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. The low temperature system removes heat from the space to be cooled using an evaporator, and transfers it to a heat exchanger that is cooled by the evaporation of the refrigerant of the high temperature system.

What is back pressure valve?

A back pressure valve is a type of control valve that holds pressure on production vessels such as separators, treaters, and free water knockouts and releases upstream pressure when a designated set point is reached.

What is back pressure in refrigeration system?

Back pressure valve is a spring loaded non-return valve. It is fitted just at the exit of the refrigerant from the evaporator coil in a multi temperature rooms system. This being fitted at the exit of the compartments whose temperature is set higher (usually at about 4-5 degrees centigrade).

https://www.youtube.com/watch?v=WGQZhuaF00Q